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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e926e1854daaffcef960a83cf4d52c717fdb7833d98db955d5585b1afc04af09' 
  AND token = '8JkCAUCtYHCFFX4SvrxV72oNAZ9L0gdSrnFDIOyfJ7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}